Java kills

My nerves.
My whole nervous system is already decimated, to be honest.

Let's start from the beginning. I wanted to play Minecraft, so that's coming out. With a variety of mods, of course. The game was originally identified myself 1022 MB. operatives, but after 10-15 minutes flew stating that all available memory is used. Its just I have 16 GB, if that. Well, no, we did not make a finger, climb to the forums, find the instructions, make jabu the game to allocate more memory.
And then problem number one: Jaba suddenly refuses to allocate more than 512 MB, no matter how much was written in the settings as Jaba and the game itself.
After a long anal-carnival with my brain, nerves and Jaba, it was decided to reinstall jabu. To do this, we take down the old version, download from the official website of the new.
And then problem number two: it is not installed.
Because it is not yet removed.
And not removed.
Because has already been removed.
\_(ツ)_/
Thank you-please error code 1603, the cause of the error is unknown, contact our support team impossible guys soatb.

Who faced, I can now do to say goodbye to the game, and with the Jaba or not?